>INET6 is defined unconditionally by the inclusion of
>basesrc/lib/libwrap/Makefile.cflags
>INET6 and NETISO (!!!) are both defined unconditionally
>by the inclusion of gnusrc/gnu/usr.sbin/sendmail/Makefile.inc
we define them unconditionally to help people who gets binary
distribution happy. basically, binaries are designed to be
"protocol independent" - works fine on IPv4-only kernel, IPv4/v6
kernel and IPv6-only kernel.
if we make them conditional, binary builds will become complicated
too much (and impose pain to users).
itojun